Oxidation Numbers and Hydroxide Ion

This video tutorial explains how to determine the oxidation numbers for each element in the hydroxide ion (OH-). It begins by identifying the elements involved, oxygen and hydrogen, and then applies specific rules to assign oxidation numbers. Hydrogen, when bonded to non-metals, has a +1 charge, while oxygen typically has a -2 charge. The video demonstrates that these oxidation numbers fit the rules without additional calculations. The tutorial concludes by verifying that the sum of oxidation numbers matches the overall charge of the hydroxide ion.

Which element in the hydroxide ion is represented by the red color in the image?

• Oxygen

• Hydrogen

• Nitrogen

• Carbon

What is the oxidation number of hydrogen when it is bonded to non-metals?

• +2

• 0

• +1

• -1

What is the typical oxidation number assigned to oxygen in compounds?

• +2

• -2

• +1

• -1

How do the oxidation numbers of hydrogen and oxygen in hydroxide ion add up to match the ion's charge?

• They add up to +2

• They add up to 0

• They add up to +1

• They add up to -1

What is the overall charge of the hydroxide ion?

• 0

• +1

• +2

• -1